From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70B00C432C0 for ; Thu, 21 Nov 2019 07:29:48 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3E8762089F for ; Thu, 21 Nov 2019 07:29:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E8762089F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D4C566B02B4; Thu, 21 Nov 2019 02:29:47 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id CD5A06B02B8; Thu, 21 Nov 2019 02:29:47 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BC6A46B02C4; Thu, 21 Nov 2019 02:29:47 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0032.hostedemail.com [216.40.44.32]) by kanga.kvack.org (Postfix) with ESMTP id A2B826B02B4 for ; Thu, 21 Nov 2019 02:29:47 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 54527181AEF1F for ; Thu, 21 Nov 2019 07:29:47 +0000 (UTC) X-FDA: 76179460014.09.girl25_3849a89adc604 X-HE-Tag: girl25_3849a89adc604 X-Filterd-Recvd-Size: 2134 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Thu, 21 Nov 2019 07:29:46 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 517D368B05; Thu, 21 Nov 2019 08:29:43 +0100 (CET) Date: Thu, 21 Nov 2019 08:29:43 +0100 From: Christoph Hellwig To: Christian Zigotzky Cc: Christoph Hellwig , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Benjamin Herrenschmidt , paulus@samba.org, darren@stevens-zone.net, "contact@a-eon.com" , rtd2@xtra.co.nz, mad skateman , Rob Herring , linuxppc-dev , nsaenzjulienne@suse.de Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M Message-ID: <20191121072943.GA24024@lst.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000752, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Nov 16, 2019 at 08:06:05AM +0100, Christian Zigotzky wrote: > /* > * DMA addressing mode. > * > * 0 : 32 bit addressing for all chips. > * 1 : 40 bit addressing when supported by chip. > * 2 : 64 bit addressing when supported by chip, > * limited to 16 segments of 4 GB -> 64 GB max. > */ > #define SYM_CONF_DMA_ADDRESSING_MODE CONFIG_SCSI_SYM53C8XX_DMA_ADDRES= SING_MODE >=20 > Cyrus config: >=20 > CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=3D1 >=20 > I will configure =E2=80=9C0 : 32 bit addressing for all chips=E2=80=9D = for the RC8. Maybe this is the solution. 0 means you are going to do bounce buffering a lot, which seems generally like a bad idea. But why are we talking about the sym53c8xx driver now? The last issue you reported was about video4linux allocations.